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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7036429913bbacada17a56f2a246ad673b4472552b3778a8b7d12cf6ae8e7968' 
  AND token = 'gsjefRyM9YDAXkas+HL/8EbSE18ekbTWZBweq5IvQqk=' 
  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"
    }
  }
}