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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80600dbe80444463f1c351dd63ac50c5935d0a0d0a6ab3dc064ff7d6fcc25d9' 
  AND token = 'JWOYhD7la2JA5+4tXBc1l78hr8xeGQQoapu6kRKFJAw=' 
  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"
    }
  }
}