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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c22c00fa59f9c7bdc7ab0b850a73265e3bd2e6fa9f809d2b3ec31c3f5790c6e' 
  AND token = 'v08o8tEyb+I5lyn91f0h3oZ7ZXWOH3CZmhvxj+6rsH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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