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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0ec75b45907392452b31f8750f1d1011298dafb5f5652a286b67fcf938f804' 
  AND token = 'LS6FGLJuvs9fFu9vbdhkW0kirPUm3cpvx7uHaMjCKEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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