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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ae6148027f51f08ed43c4bb5e0643c217767492bf15b3cd82cbdfee1373a2e' 
  AND token = 'q6G2ToEoq0BFgXK5uwCpwBs0VSLg1GRzs2tI/pM5Vts=' 
  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"
    }
  }
}