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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61bc687e259cb711ab9aa561b68c5029eb6b0859d8f37f370073ea5c8c08cbf' 
  AND token = 'jkN5suZw97zx4C6rtR0IGZk46xUJwSkY4q375op8UQU=' 
  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"
    }
  }
}