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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45a188f283a57459a015770b37a9873cbad0d52e1d420b8ca5721206bae12f8' 
  AND token = 'WWX6xFVHX6xFxoqoDgXVG5UtEwUZNuH2kL2VgZseguE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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