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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f787a0215880c8085daaacaf94d7ea09b49a9070248c38e897d7ed52fa9674' 
  AND token = 'YEM0jpzswDqud50LJiy+I0rx0bcQs/yL+L+IihhmE8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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