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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f07a0ef830c1e103c32bd69709a651d92a0c0bfa87676a5bc6a024767a46d9' 
  AND token = 'fKibZq0fgOupu0z4ReP/AZYMSyN/rH1BDhY11M4SwUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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