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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c054e544021aa4a26b7dc5492c3cad953a435bb669d48a4816d46695a38fccd' 
  AND token = 'Rp8gbIO6/6TptkJPifWwpuHUURXCtLDb2exFR8yTJS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}