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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae7b49f2056225e4271ec207cf6b2d7aba4d6620749d1962651a9ef9f844ac7' 
  AND token = 'orfdevAj0/JGiSUVf4R5mvJmJjTfZrpxG5Jv3hV0VYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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