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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4c221e976154416705fe7fb07881b056a70688011da8625a74302931492839' 
  AND token = 'DW7P+5k4HRlibkNV+fa1NN5asVoPKEjV168pT1j8AYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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