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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25907fbfce9a4fd66f2807d8877d0e8914d6502f376e7a367199bfdb542fd77c' 
  AND token = '4SotxEU8di9rdVzfgISMPC20XAQ+/DmYknME6ZUC3tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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