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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a76516200155a8cda52355b3ab44d782b88a098f33f9d6be48e0a5da249bc5e' 
  AND token = '0VP+eb6KTJ8gFQymMuVbLDuKC0gvH/Fe8an9mlRzGY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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