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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52a7d092173ccd29fd1263127012fe3cdb18fea9433b5c833ed247c1c5cc7cb' 
  AND token = 'rEHPglPa+IpuG4yCzont4SCrL6JgRjiSImc4tnotvfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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