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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ccbf8f15a42b177026c1bf093a869c3c6eec0a1619610bf3c0b88c88da1edc' 
  AND token = 'onG+tLjhthXh9IHDt/I56b+OxvKLS/oN0mqr8+MHDGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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