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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb6157572a6b24b0871ff581bc3643632a4d3d966649d47c448b99f6a16b7e5' 
  AND token = '6R48Rp2ISObvZq9eyNxOkT6d4Nt9YvCNdNQngT7Q7uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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