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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba85489c37fe0508cfba6c0b30fb2c243c80d25c304a8fce449ebca173dece95' 
  AND token = 'mauCGWsUMtSGDh2lBZhbe5PXcHR++vMNVjubv+6UooQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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