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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e41d1a5451ea4298aebe4a58ab466b4686de5b3a0e632d0f06fb92b6ab120ad' 
  AND token = 'radygJHYkIX0mc6NSs2Hai0rf8r8Ox+XBnGzphcxgXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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