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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9f4cf3e88a5d0735fe4b8dfcb6880aa65f68afefc7affb30d88c3c55555d1e' 
  AND token = 'H4IC8atAQITckvTXpnCoyJeghAIAf4onq+rXlMvxdHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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