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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d613ed3a6e1e4962b972d0c3c6e1f1738fffd6946986499b3c7cfa125e4037' 
  AND token = 'fdR1cxrm0zFapkQYViv/RsbAuqkjCsSKB/8VqDau7Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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