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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf513eb7be62d526e23cfe70a5f96151fb0d8a4777f36433af39070d681a2a3a' 
  AND token = 'aMgH5G/l/c4JwGO9pQJGNNlRoC0DNlDHDJOyGax/yrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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