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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7afe6474d8dc3fa423880b37bad2bbbefdb9fea5d3ec05144680af8d5d869c' 
  AND token = '1ipH0QPMiWo52PN+3/97NfLN0qjxPb6SnKp17tGtCpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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