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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e12bac1ae4354ec97bf3149eac7ff491d63639df31b42f7d4490ff07edb4fb52' 
  AND token = '7ZkCkcTOyHaxZ+G90Uph8g+2BGpVwJb4F18cw0syNUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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