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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7bdfa0c69994a970dc8d71ced91695a5f7d96e820dae369f54233c64db24da' 
  AND token = 'ed0dmV0QQ9ewts2l9jmpPuRoOp1yvi/+jdn/Egx/7AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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