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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee1ddf5c1fb60118aeb2b32c5a77defe3ad6fd45e72c5b52b09e79d3dfcf272' 
  AND token = '0NWWw9/NXGw8Zi5HZl+bcDsz62/+5r2AAlA7c6xt6Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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