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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e194961e7d72f61708d6cd514d295c917d16e7ea37ee3e0a8215ecef023e5275' 
  AND token = '7Ht+Vh4qV8iKtyYrcHuSp3FHIBw7RFofaksTCF9sn8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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