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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36da8fde777af2050c09b9e861d3413e5314ac966bafd06204e25d5b8da74bc' 
  AND token = 'POXoiIC5IhKgt1mj4y6uocKaKm299Nqzb6oQpVALcrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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