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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf45637b5b2ee374680ec59a67eecb8a5bc5646668318c6b4ddd0f9a8509610d' 
  AND token = 'w/1OeGgEe9t+4/SqIB36ettxvRGv1wPzMcdt6Z5mowo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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