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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00cdc662d06a7b10535bf9f9dbd2c3249f863400ecd6c823b4b57d8b2ee37304' 
  AND token = 'P4k41MA2ic7VsJ4WK3XPsKN5A/4hn9gg6xtzabMDRJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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