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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81f0656cedb403ce53614b92f0eb80a7c2785bc96de2eddf9fad4f7c1ce620a' 
  AND token = '1qS31aruTnke+9iMe4HkBNz/lR1DSkh08h6iaahNIds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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