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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27022615b732a3066e7ea4b4a9819d96f52f8f4c49924e7da36be9867b9b599' 
  AND token = 'D0GdGob9ec3i1nJTbGly2Z+EkBoKZ7IDaBoTYN09eSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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