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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c757f9cb0e2c2a0be10c1dee8411ae9c64e62d0306011748db3cc99ce6684fd8' 
  AND token = 'eCWkuL9jozffCRsxGf9RYIDeLArYuOBNvHkp5Z+quww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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