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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d5d786bc814fa09d812184d1d2aeb7d9c16f91d23558248680cf41435d3162' 
  AND token = '7/03B/UrngnD+lNoc3I1QHL+Oy2bo1FSKuoirSv4EPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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