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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd64cfcaf80067a7e21a8dedb1c9a1d6c9f387e779a475bacc92099f3d203cb' 
  AND token = '9+dl+u1HBI2oEyQkRlkFfozVFB0yN+s50HJaqdXcpBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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