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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd546fb49c03a3e93527f8e5f14a7c195584d83986b48f1d49913b3279d062489' 
  AND token = 'B5tRKMPR5MlNacLcxdw/C1TTApx2oPBDGyqsaW/+D8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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