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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e432fda6d05f01115bda3ad5a6ea3e1010dddada24d46e5f5f9c24b09d63c2e0' 
  AND token = '0wVFUDWAbtQMcVJl5Jve+HuCoEIOzrmSyosZT7E2dzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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