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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b40bc53942bd987f8754fc90b0476503f9d90421ecfa5563c3d0f5ae7e96dbe' 
  AND token = 'gea6PemkNnaRcCaULfJxBuGeTCCRV9fcQqoNQdRunxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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