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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8aa65fb13770d0d1a3924c930f3ddb8e402fcd8fdaebc77ce7b7127fb6e1e0' 
  AND token = 'X9jCBV9qsANB9bH3dwtASLSTwVZ+QK51jH8+U3x3DgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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