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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0843c5f373e54eda5c85091f0d009042508babb2a2b0f1a02caa3961f7d7e199' 
  AND token = 'jA1vjGEmv+CJin4IVuWS7fTgpFgmFYx/10+bzMtiF6A=' 
  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"
    }
  }
}