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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6003725d5f25d3dc2eeb032baf498624a96d86490503b13befc8c5c0e25a3e4' 
  AND token = 'qzIV2os2IpqcSpzw69BO4JogadTUSQVLtNeH5AdOTiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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