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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b194c67dde3a8af8942f160111fdd1aed6bf1479b1b2df167237a0c9e54a914' 
  AND token = 'FE52wWeSqO5g+WNPsQXQgIJKrq+ruY25J4UpoPdoRh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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