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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363e8a7ec49a5ebcad56e25a3a0d6e7b3bf9ebc914a9c615f9f7b3d03bd0ecd7' 
  AND token = 'ipzKbNbsiRFoRRax4Qb2yfFEcyuA5lCOw3eLUMdKZvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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