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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35d79850e10025ad095d0bef4dc8c94c2ded811ad11c0d9e2856302b26585e4' 
  AND token = 'NyYrh9qh2FPbo3B6RD9+6QNEX0QRAGcSPcEyi4CAdo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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