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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d6fa99c98b8f0772fd6b87b6f6acb76d3f3401fa94abb195bef0d64ed3e2d55' 
  AND token = 'y6Pn5GeUSVTHOcp4cSVzPb0+pPf2bgdkV0OIW25J3jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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