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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854be97c46d97ae194d67f970ed749acd8dd526c9209192d85da36355dd8501d' 
  AND token = 'VTEUR0Wj2fDDGxXN+McwQXOIp9cYgvvW4+rhSRWE4jk=' 
  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"
    }
  }
}