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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4caf69aaa6dbe7da044c0538d7ceea1edb412305ea25b80cc51c790b37cf049' 
  AND token = 'vvpEtHHItdLv2zR8Tfh8MFIH8Nxk06vQwk8J9/b0iqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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