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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead1412c439fbb5e86b246a69eec9fac25901da0ba3ab8d37407113f45ff52bc' 
  AND token = 'ekdW0AW2X3+dYPiVkIWqMBiyNI13gw3GVpYxuDRq7Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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