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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1208dee22f77e4c9f64d0cfae59d94a2a40e6d96847d48f3caf9393d20936bf3' 
  AND token = 'BJ3J5bZX8rb+GJNthEkyLMZsSz26S1B+vM9qQ8MDnwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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