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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a33efd50b178ee449ba0fda53c4c04f745aed72c908ee07b299e27b003e3e64' 
  AND token = 'gUdwDMJSMupmOrfUT7M7o1H1ZrgvAHeI8wzTolkgSKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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