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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cab69b70f47f502eb008b7185d34be0c791ffaaf1d4b08fdc2aa4a6b6ffc7cb' 
  AND token = '1kMvcOBlZmzeWcXE97aBWXiocGMO6/C4SJU/68mVb/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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