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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520eae5f8c15652c77ded3e2f68bd298e6acdd086f27a85082bc3a2eb2311491' 
  AND token = 'I4g/+h3DUA61O8Bhb3JIykkQDyg4/tgGNTsVvi/QagE=' 
  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"
    }
  }
}