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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45a119ba6716c4e3c593df529064ac786c17e6add46bd5aba4daa28f1d5bfa3' 
  AND token = 'YPE9QBxUOerEiWetcCLV0LH3i/xKvLq+q40S0ku/4hI=' 
  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"
    }
  }
}