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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de8caa89f08165c5c10e18f9fa2c55cb5d1f8982bdf10fab6646bb21ba93a4e' 
  AND token = 'n+5ZGhH9+SaRhrfm7t5P5VZlW8cRMJIqDeidWSzf/ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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