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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a4be159dd67fc5a0ba2b8a35202716a310b1043024147699145eaf982c2099' 
  AND token = 'w77Up8eL1Y/O3XMRs09gh313W4z8sguFVX/XEd67gcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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